WO2024010264A1 - 축방열 싸이클에 안정한 다공성 구조의 고밀도 열저장 성형체 및 그 제조방법 - Google Patents
축방열 싸이클에 안정한 다공성 구조의 고밀도 열저장 성형체 및 그 제조방법 Download PDFInfo
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Definitions
- the present invention relates to a high-density heat storage molded body with a porous structure that is stable in axial heat dissipation cycles and a method of manufacturing the same.
- thermochemical heat storage is attracting attention as a next-generation heat storage technology because it has the advantage of significantly higher heat storage density, less heat loss, and longer storage period.
- Thermochemical heat storage technology is a technology that stores and uses heat for a long period of time using the endothermic-exothermic reaction that occurs when materials such as calcium carbonate and zeolite are chemically converted.
- Magnesium oxide (MgO) is a thermochemical heat storage material for storing waste heat at medium to low temperatures (150-300 °C).
- the heat storage density of magnesium oxide (MgO) is 3.4 GJ/m 3 , which is 17 times that of water, a common heat storage material, and is a thermochemical heat storage technology.
- the storage density is about 4.3 times higher than that of zeolite, which is being widely studied. Additionally, because it is non-toxic and inexpensive, MgO is considered the most promising high-density storage material in terms of storage density, price, and stability.
- MgO as a heat storage material, such as research on improving kinetics through doping in powder form and research on lowering the heat storage temperature through additives.
- the reaction area is reduced due to powder agglomeration that occurs during the axial heat dissipation cycle, which causes a decrease in heat storage performance.
- manufacturing technology in the form of a molded body is required, but due to the volume change due to the phase change of the MgO-based material, it is difficult to maintain the shape of the molded body in the axial heat dissipation cycle, and research on this is minimal.
- the present invention was devised to solve the above-described conventional problems.
- a high-density heat storage material (MgO) molding technology developed based on ceramic sintering technology, but also the MgO material
- the purpose is to provide a multi-structure manufacturing technology that can maintain axial heat dissipation cycle characteristics.
- the purpose is to provide a technology for manufacturing a porous heat storage molded body with stability in an axial heat dissipation cycle by synthesizing MgO, a high-density heat storage material, through a wet powder manufacturing process and then adding SiC fiber. There is.
- the first object of the present invention is to provide a molded body that is stable in axial heat dissipation cycling through the addition of ceramic fibers, including ceramic powder; and ceramic fibers mixed with the ceramic powder. It can be achieved as a thermochemical heat storage molded body, characterized in that it includes.
- the ceramic powder mixed with ceramic fibers may be pressurized and heat treated at high temperature to form a porous molded body.
- the ceramic fiber is at least one of SiC fiber, Al 2 O 3 fiber, and ZrO 2 fiber
- the ceramic powder is at least one of char powder containing an organic compound, MgO powder, and CaO powder. It can be characterized as:
- a second object of the present invention is a method of manufacturing a molded body stable in an axial heat dissipation cycle through the addition of ceramic fibers, comprising the steps of manufacturing ceramic powder; mixing ceramic fibers with the ceramic powder; Pressuring and molding the mixed powder; And it can be achieved as a method of manufacturing a thermochemical heat storage molded body, including the step of heat-treating the manufactured molded body at a high temperature to form a porous molded body.
- the step of preparing the ceramic powder may be characterized by preparing ceramic powder or commercial powder manufactured by a wet process method.
- wet process method may be characterized as at least one of the Pechini method, sol-gel method, and colloidal process.
- the step of mixing the ceramic fibers with the ceramic powder may be characterized by adding a pore former to form a porous structure.
- the ceramic fiber is at least one of SiC fiber, Al 2 O 3 fiber, and ZrO 2 fiber
- the step of mixing the ceramic fiber with the ceramic powder is, in the case of the powder synthesized by the wet process method, an organic compound It may be characterized by mixing the powder in a char state with ceramic fibers.
- the mass ratio of the added ceramic fiber may be in the range of 0.5 to 5% compared to the char powder.
- the mixed powder is put into a mold and pressed to mold, the area of the molded body is determined by determining the area of the mold, and the thickness is determined according to the amount of powder. It can be characterized as:
- the ceramic powder is at least one of MgO powder and CaO powder
- the MgO powder production through the Pechini method is synthesized by dissolving magnesium nitrate in distilled water, and nitrate is added by adding citric acid. It can be characterized by facilitating the synthesis of the solution and adjusting the appropriate pH using ammonium hydroxide.
- the heat treatment step may be characterized in that pores are formed by removing organic residues contained in char.
- the manufactured porous molded body can be characterized as having a porosity of 30-70%.
- the step of high-temperature heat treatment of the manufactured molded body it may be performed at a high temperature of 800 °C to 1300 °C in air for 2 to 5 hours.
- the method for manufacturing a high-density heat storage molded body with a porous structure that is stable in axial heat dissipation cycles not only is a high-density heat storage material (MgO) molding technology developed based on ceramic sintering technology, but also axial heat dissipation of MgO material. It is possible to provide a multi-structure manufacturing technology that can maintain cycle characteristics.
- MgO high-density heat storage material
- MgO a high-density heat storage material
- SiC fiber is added to produce a high-density heat storage molded body in an axial heat dissipation cycle. It has the effect of producing a stable porous heat storage molded body.
- thermochemical heat storage technology of MgO has mainly been conducted on material development based on powder form.
- THS thermochemical Heat Storage
- manufacturing technology in the form of a molded body is required.
- instability in maintaining the structure of the molded body due to volume expansion and contraction due to the axial heat cycle causes powdering and agglomeration of the molded body, resulting in a decrease in cycle characteristics that reduces material diffusion. This is a factor that hinders the introduction of MgO's THS system.
- thermochemical heat storage technology serves as a bridge between materials and actual systems. This can greatly contribute to the introduction of an empirical THS system for the developed heat storage material.
- FIG. 1 is a flow chart of a method for manufacturing a high-density heat storage molded body with a porous structure that is stable in an axial heat dissipation cycle according to an embodiment of the present invention
- Figure 2 is an image of a thermochemical heat storage molded body manufactured according to an embodiment of the present invention, showing a) a molded body without SiC fibers added, b) a molded body without SiC fibers added,
- Figure 3 is a table of porosity, hydration, and dehydration conversion rates of thermochemical heat storage molded bodies manufactured according to an embodiment of the present invention
- Figure 4 is an XRD graph a) before hydration and b) after hydration of a molded body with added SiC fibers manufactured according to an example of the present invention
- Figure 5 is an SEM image of a molded body with added SiC fibers manufactured according to an embodiment of the present invention.
- Figure 6 shows an axial heat dissipation cycle stability test of a molded body with added SiC fibers manufactured according to an embodiment of the present invention
- Figure 7 is an image after axial heat dissipation cycle manufactured in an example of the present invention a) a molded body without SiC fibers added, b) a molded body with SiC fibers added
- a method for manufacturing a high-density heat storage molded body with a porous structure that is stable in an axial heat dissipation cycle according to an embodiment of the present invention will be described.
- a high-density heat storage material (MgO) molding technology is developed based on ceramic sintering technology, and a multi-structure manufacturing technology capable of maintaining the axial heat dissipation cycle characteristics of the MgO material is provided.
- Figure 1 shows a flow chart of a method for manufacturing a high-density heat storage molded body with a porous structure that is stable in an axial heat dissipation cycle according to an embodiment of the present invention.
- ceramic powder is prepared (S10).
- the ceramic powder may be composed of MgO powder, CaO powder, etc., and commercial powder may be used, or ceramic powder manufactured by a wet powder manufacturing process may be used.
- pore formers such as carbon black, starch powder, graphite, and rice bran are added to form a porous structure.
- nano powder materials synthesized based on wet powder manufacturing processes are used to manufacture porous molded bodies. .
- magnesium nitrate hexahyddrate (Mg(NO 3 ) 2 ⁇ 6H 2 O) is dissolved in distilled water and synthesized using a wet manufacturing method.
- citric acid is added to facilitate the synthesis of a solution containing nitrate, and ammonium hydroxide is used to adjust the appropriate pH.
- the powder synthesized by this wet powder manufacturing method contains organic residues.
- powder synthesized using the wet powder manufacturing method is in the form of a char-state powder containing organic compounds.
- mixed powder is manufactured by adding and mixing ceramic fiber (hereinafter referred to as fiber) to MgO powder (S20).
- Ceramic fibers may be SiC fibers, Al 2 O 3 fibers, ZrO 2 fibers, etc.
- the mass ratio of SiC fiber added is in the range of 0.5 to 5% compared to char powder, and the char powder and SiC fiber are mixed evenly.
- a MgO composite is manufactured by adding ceramic SiC fibers to overcome the decrease in heat storage characteristics due to volume expansion due to axial heat dissipation cycle.
- SiC fibers By adding a small amount of SiC fibers, it not only suppresses the occurrence of cracks due to volume expansion upon hydration of MgO by adhesion between the fibers and the matrix (MgO), but also suppresses the growth of cracks by bridging with the matrix. It becomes possible.
- the mixed powder of nano-ceramic powder and SiC fiber synthesized using a wet manufacturing method is placed in a mold suitable for the shape and size to be manufactured and pressed to produce a molded body (S30).
- the area of the molded body is determined by determining the area of the mold.
- the thickness of the electrode can be determined depending on the amount of mixed powder, and there is no limit to the thickness.
- a porous MgO-SiC fiber composite molded body with SiC fibers added can be manufactured.
- organic residues contained in char are removed and pores are formed.
- the porous molded body has a porosity of 30-70%.
- the step of high-temperature heat treatment of the manufactured molded body is performed at a high temperature of 800°C to 1300°C in air for 2 to 5 hours.
- thermochemical heat storage molded body manufactured according to the above-mentioned embodiment of the present invention will be described.
- Figure 2 is an image of a thermochemical heat storage molded body manufactured according to an embodiment of the present invention. a) is a molded body manufactured through nano powder synthesized by the pechini method without adding SiC fibers, and b) is a molded body manufactured through a powder synthesized by the pechini method. This is a molded body manufactured by adding SiC fibers.
- Both molded bodies were heat treated at 1100°C for 3 hours. It is possible to freely manufacture heat storage molded bodies in various shapes and sizes by selecting a mold that suits the shape and size to be manufactured.
- Figure 3 shows a table of porosity, hydration, and dehydration conversion rates of thermochemical heat storage molded bodies manufactured according to an embodiment of the present invention. Porosity was measured using the Archimedes method, and higher porosity was confirmed in the molded body with SiC added.
- Figure 4 shows XRD graphs a) before hydration and b) after hydration of a molded body with added SiC fibers manufactured according to an example of the present invention.
- both MgO and SiC peaks could be confirmed before hydration.
- after hydration not only the Mg(OH) 2 and SiC peaks generated during hydration of MgO, but also the MgO peak could be confirmed. This is because hydration was not 100% achieved.
- Figure 5 shows an SEM image of a molded body to which SiC fibers were added manufactured according to an embodiment of the present invention. As shown in Figure 5, it can be confirmed that the manufactured molded body is a porous structure, and it can be confirmed that the added SiC fibers are well adhered to the MgO matrix and play a crosslinking role.
- Figure 6 is an axial heat dissipation cycle stability test of a molded body with added SiC fibers manufactured according to an embodiment of the present invention. That is, Figure 6 shows the hydration and dehydration conversion rates in an axial heat dissipation cycle stability test of a molded body to which SiC fibers were added. As shown in Figure 6, it can be seen that stable hydration ( ⁇ 65%) and dehydration ( ⁇ 57%) conversion rates were shown without performance decrease even after 10 axial heat cycles.
- Figure 7 is an image of a) a molded body without SiC fibers added and b) a molded body with SiC fibers added after an axial heat dissipation cycle manufactured in an example of the present invention.
- Figure 7 (a) is an image of the molded body without SiC fiber added after the first cycle. Cracks occurred in the molded body due to the volume change accompanying the phase change to Mg(OH) 2 due to hydration, making it impossible to maintain the shape. It was confirmed that this was the case.
- b) is an image after the 10th cycle of the molded body with SiC fiber added, confirming that the shape can be maintained even through repeated axial heat dissipation cycles.
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Abstract
Description
Claims (15)
- 세라믹 섬유의 첨가를 통한 축방열 싸이클에 안정한 성형체로서,세라믹 파우더; 및상기 세라믹 파우더에 혼합되는 세라믹 섬유;를 포함하는 것을 특징으로 하는 열화학 열저장 성형체.
- 제 1항에 있어서,세라믹 섬유가 혼합된 세라믹 파우더를 가압 성형, 고온 열처리하여 다공성 성형체 형태를 갖는 것을 특징으로 하는 열화학 열저장 성형체.
- 제 2항에 있어서,상기 세라믹 섬유는, SiC 섬유, Al2O3 섬유, 및 ZrO2 섬유 중 적어도 어느 하나이고,상기 세라믹 파우더는 유기 화합물이 포함된 char 상태의 파우더, MgO 파우더, 및 CaO 파우더 중 적어도 어느 하나인 것을 특징으로 하는 열화학 열저장 성형체.
- 세라믹 섬유의 첨가를 통한 축방열 싸이클에 안정한 성형체 제조방법으로서,세라믹 파우더를 제조하는 단계;세라믹 섬유를 상기 세라믹 파우더에 혼합하는 단계;혼합된 파우더를 가압하여 성형하는 단계; 및상기 제조된 성형체를 고온 열처리하여 다공성 성형체 형태로 제조하는 단계;를 포함하는, 열화학 열저장 성형체의 제조 방법.
- 제 4항에 있어서,상기 세라믹 파우더를 준비하는 단계는,습식공정법에 의해 제조된 세라믹 파우더 또는 상용파우더를 준비하는, 열화학 열저장 성형체의 제조 방법.
- 제 5항에 있어서,상기 습식공정법은, 페치니 공법(Pechini method), 졸-겔법(sol-gel) 및 콜로이달 합성법(Colloidal process) 중 적어도 어느 하나 인, 열화학 열저장 성형체의 제조 방법.
- 제 5항에 있어서,상기 세라믹 섬유를 세라믹 파우더에 혼합하는 단계는, 상기 상용파우더의 경우, 다공성 구조를 형성하기 위해 기공 형성제를 첨가하는, 열화학 열저장 성형체의 제조 방법.
- 제 5항에 있어서,상기 세라믹 섬유는, SiC 섬유, Al2O3 섬유, 및 ZrO2 섬유 중 적어도 어느 하나이고,상기 세라믹 섬유를 세라믹 파우더에 혼합하는 단계는, 상기 습식공정법으로 합성한 파우더의 경우, 유기 화합물이 포함된 char 상태의 파우더를 세라믹 섬유와 혼합하는, 열화학 열저장 성형체의 제조 방법.
- 제 8항에 있어서,상기 세라믹 파우더를 세라믹 섬유와 혼합하는 단계에서는, 첨가하는 세라믹 섬유의 질량비는 상기 char 파우더 대비 0.5~5% 범위인, 열화학 열저장 성형체의 제조 방법.
- 제 4항에 있어서,상기 혼합된 파우더를 가압하여 성형하는 단계는, 상기 혼합된 파우더를 몰드에 넣어 가압하여 성형하고,상기 몰드의 면적을 결정함에 따라 성형체의 면적이 결정되며, 파우더의 양에 따라 두께가 결정되는, 열화학 열저장 성형체의 제조 방법.
- 제 6항에 있어서,상기 세라믹 파우더는 MgO 파우더, 및 CaO 파우더 중 적어도 어느 하나이고,상기 페치니 공법(Pechini method)을 통한 MgO 파우더 제조는, 마그네슘 나이트레이트를 증류수에 용해시켜 합성하며, 시트르산을 첨가하여 질산염이 첨가된 용액의 합성을 용이하게 하고 수산화암모뉼을 이용하여 적정 pH를 조절하며 합성하는, 열화학 열저장 성형체의 제조 방법.
- 제 8항에 있어서,상기 제조된 성형체를 고온 열처리하여 다공성 성형체 형태로 제조하는 단계에서, 열처리 단계는 char에 포함된 유기 잔류물을 제거하여 기공을 형성하는, 열화학 열저장 성형체의 제조 방법.
- 제 12항에 있어서,제조된 다공성 성형체는 30-70%의 porosity를 가지는, 열화학 열저장 성형체의 제조 방법.
- 제 4항에 있어서,상기 제조된 성형체를 고온 열처리하는 단계에서, 공기 중에 800 ℃ 내지 1300 ℃의 고온에서 2시간 내지 5시간 수행되는, 열화학 열저장 성형체 제조 방법.
- 제 4항 내지 제 14항 중 어느 한 항에 따른 제조방법으로 제조된 것을 특징으로 하는 열화학 열저장 성형체.
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| DE112023002988.1T DE112023002988T5 (de) | 2022-07-07 | 2023-06-27 | Wärmespeicherformkörper hoher dichte mit in wärmespeicher- und -abgabezyklus stabiler poröser struktur und verfahren zu seiner herstellung |
| US18/700,915 US20250269555A1 (en) | 2022-07-07 | 2023-06-27 | High-density heat storage molded body having porous structure stable in heat storage and release cycle, and method for manufacturing same |
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| KR102911977B1 (ko) | 2026-01-14 |
| KR20240006995A (ko) | 2024-01-16 |
| DE112023002988T5 (de) | 2025-04-24 |
| US20250269555A1 (en) | 2025-08-28 |
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